$x^2+5x-8$
$5x^2+70x+49$
$2\sin\theta\cos\theta=\cos\theta$
$3,3-5,5$
$\left(2y^3-5\right)\left(y^2+2y-3\right)$
$7x<56$
$2\left(x+y\right)^2\left(x-y\right)^2-4x^2$
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